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20 September 2011 Visible to infrared down conversion in rare-earth doped fluorides for luminescent solar converters
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Abstract
Downconversion is investigated as a promising way to enhance silicon solar cells efficiency. The efficiency of the downconversion process is investigated for the (Pr3+, Yb3+) codoping in two fluoride hosts: KY3F10 and CaF2. Strong near-infrared emission from ytterbium ions after excitation of praseodymium ions at 440 nm is observed in both KY3F10 and CaF2 as a result of the efficient energy transfer from praseodymium to ytterbium. In particular, very high Pr3+ to Yb3+ energy transfer efficiencies (ETE) are achieved for low Yb3+ and Pr3+ concentrations (ETE=97% in CaF2:0.5%Pr3+- 1%Yb3+) in CaF2 in comparison with KY3F10. A low Yb3+ concentration offers the advantage to limit the Yb3+ concentration quenching which is observed in other hosts, where the Yb3+ concentration has to be larger to achieve a high ETE for solar cell applications.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. Serrano, A. Braud, J.-L. Doualan, P. Camy, and R. Moncorgé "Visible to infrared down conversion in rare-earth doped fluorides for luminescent solar converters", Proc. SPIE 8111, Next Generation (Nano) Photonic and Cell Technologies for Solar Energy Conversion II, 811104 (20 September 2011); https://doi.org/10.1117/12.892711
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